Decarboxylated Crosslinked Polyimide Hollow Fiber Membranes for Natural Gas Purification

摘要

Natural gas processing is one of the largest industrial membrane gas separation applications, almost all for the removal of CO_2. Polyimides are a widely studied class of polymers that have very high ideal CO_2/CH_4 selectivities. However, the performance of polyimide membranes is significantly below the intrinsic membranes under normal operating conditions (mixed gas with high CO_2 partial pressure) due to membrane plasticization. High CO_2 content can swell the membranes and thus cause drastic losses in selectivity.